[:en]Swift: How to make a textfield checker if empty.[:zh]Swi[:ja]Swi[:]

[:en]How to make a simple empty text field checker.

//
//  ViewController.swift
//  CheckEmptyField
//
//  Created by Cambridge  on 11/4/2019.
//  Copyright © 2019 Cambridge . All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var textfield: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    // To check the textField contains
    @IBAction func pressAction(_ sender: Any) {
        
        let string = textfield.text
        if string!.isEmpty {
            print("empty")
        } else if string!.contains("Swift") {   // case sensitive
            print("Swift")
        } else if string!.contains(",") {
            print (",")
        } else {
            print ("Ready")
            
        }
    
    }
    
}

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